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(from: 1 July 2003)
Summary Upgrade Study 2003
PETRA III: A Third Generation Synchrotron Radiation Source at DESY.
K. Balewski, W. Brefeld, W. Decking, W. Drube, H. Franz, R. Gehrke, P. Gürtler, U. Hahn, J. Pflüger, H. Schulte-Schrepping, M. Tischer, E. Weckert
DESY, Notkestrasse 85, D-22603 Hamburg, Germany
 Summary_02.pdf (946KB)
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Introduction
At present the storage ring DORIS III serves as the main source for synchrotron radiation (SR) at DESY with 9 wiggler beamlines and more than 30 bending magnet stations. Two additional experimental stations are operating at the PETRA II undulator beamline. The energies provided for experiments spread from the VUV to the several 100 keV range.
Being a second generation source, the wigglers and bending magnets of DORIS III provide high flux in quite large beams. Whilst these parameters are ideal for the investigation of large samples, extremely small samples can only be investigated by strongly focused and therefore divergent beams. Due to the large source size of DORIS III it is almost impossible to generate a beam focus in the micrometer range.
In this respect modern third generation sources are much more powerful. Due to their low emittance and the use of undulators they are able to provide roughly speaking the same unfocussed flux in 1 mm2 that DORIS III wigglers deliver in several cm2. These new sources have opened a wide field of new applications, especially those that need to investigate extremely small samples, a microfocus or partially coherent radiation.
DESY's long term perspective is the TESLA linear collider and X-ray free electron laser project. The latter will provide a transverse coherent beam with peak brilliances several orders of magnitude higher than any present synchrotron radiation source. It is DESY's intention to provide also photons of very high brilliance from storage rings to the user community in addition to these new developments. For this reason it has been decided to rebuilt the 2.3 km long PETRA storage ring into a third generation source for hard X-rays from 2007 on.
In the following the plans for rebuilding PETRA will shortly be outlined, followed by the main chapter about the expected beam performance.
A more detailed description about the reconstruction of the storage ring will be presented in a second document (in preparation).
